Sony 1T405A Datasheet

Variable Capacitance Diode

Description

The 1T405A is a variable capacitance diode
designed for electronic tuning of wide-band CATV
tuners using a super-small-miniature flat package
(SSVC).

High capacitance ratio (C25/C28) is improved to
support guard band.

Features

• Super-small-miniature flat package

• Low series resistance 0.85 Ω Max. (f=470 MHz)

• Large capacitance ratio 12.5 Typ. (C2/C25)

1.03 Min. (C25/C28)

• Small leakage current 10 nA Max. (VR=28 V)

• Capacitance deviation within 2 %

1T405A

M-290

Absolute Maximum Ratings (Ta=25 °C)

• Reverse voltage VR 34 V

• Operating temperature Topr –20 to +75 °C

• Storage temperature Tstg –65 to +150 °C

Applications

Electronic tuning of VHF band and wide-band

CATV tuners

Structure

Silicon epitaxial planar type diode

Electrical Characteristics (Ta=25 °C)

Item
Reverse current
Reverse voltage

Diode capacitance

Capacitance ratio
Series resistance

Capacitance
deviation in a
matching group

Symbol

IR
VR
C2

C25

C2/C25

C25/C28

rs

∆C

Conditions
VR=28 V
IR=1 µA
VR=2 V, f=1 MHz
VR=25 V, f=1 MHz

CD=14 pF, f=470 MHz

VR=2 to 25 V, f=1 MHz

Min.

34

32.96

2.53

12.0

1.03

The continuous 20 pieces of ∆C are guaranteed.

Typ.

12.5

Max.

10

38.96

2.96

0.85

2

Unit

nA

V
pF
pF

Ω

%

Sony reserves the right to change products and specifications without prior notice. This information does not convey any license by
any implication or otherwise under any patents or other right. Application circuits shown, if any, are typical examples illustrating the
operation of the devices. Sony cannot assume responsibility for any problems arising out of the use of these circuits.

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E97109-TE

1T405A

100

Diode capacitance vs. Reverse voltage

50

20

10

5

C-Diode capacitance (pF)

2

1

12 5 1020 50

V

R-Reverse voltage (V)

Reverse current vs. Ambient temperature

1000

Ta=25°C, f=1MHz VR=28V

100

-Reverse current (pA)

R

I

100

10

1

–20 0 20 40 60 80

Ta-Ambient temperature (°C)

10000.00

Reverse current vs. Reverse voltage

1000.00

Ta=80°C

100.00
Ta=60°C

-Reverse current (pA)

R

I

10.00

Ta=25°C

1.00
1 10 100

VR-Reverse voltage (V)

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